The compiler of the Yíxiān zhuàn 疑仙傳 (KR5a0311 / DZ 299) signs himself Yǐnfū Yùjiǎn 隱夫玉簡 — a transparent hào-like sobriquet (“Hidden Husband, Jade Tablet”) rather than a personal name. He is otherwise unknown to the historical record. The preface states only that he assembled the twenty-two biographies from materials collected casually among friends, and on account of his uncertainty about which figures were truly immortals and which were not, titled the collection “Yíxiān” 疑仙 — “presumed immortals.” Florian C. Reiter (in Schipper & Verellen eds., The Taoist Canon 2004, 2:428) places the compilation after the Tiānbǎo 天寶 era (742–756) and notes that Chóngwén zǒngmù 崇文總目 10.9a lists the Yíxiān zhuàn in one juan, while the present three-juan arrangement matches Yǐnfū Yùjiǎn’s preface. The biographies belong to the chuánqí 傳奇 genre. No CBDB record was found.